Whenever Horatio Caine or any of the CSIs are around kids, they show the best part of themselves when they are comforting the children that are usually attributed. Especially when a certain pedophilic villain from early on in the series makes appearances.
The brotherly bond between Horatio and Eric, even before Horatio became his in-law by being with his sister.
Horatio's Sunglasses are a gift from Delko after he first comes into the CSIs. he's worn them in almost EVERY episode.